Added diagnostic button. Various fixes.

What's Changed

• Diagnostic by @greghesp in #224
• Fix start time sensor. Adjust end time sensor. by @AdrianGarside in #225
• Fix firmware check on X1 by @AdrianGarside in #228
• Generate start time for P1P/S by @AdrianGarside in #230
• Delete dead mc print support by @AdrianGarside in #229

Full Changelog: v1.5.0...v1.6.0

v1.4.10

What's Changed

• Adrian/add failed state translation support (#192) by @AdrianGarside in #194

Full Changelog: v1.4.9...v1.4.10